What is this flatPHPbook?

flatPHPbook is a PHP based guestbook engine, but unlike most other of its kind it stores the guestbook data
in a flat text file and therefore does not require a database like MySQL installed on the web server.

Some of the features of this script are:

supports BBcode known from other boards and forums for formatting the posts or including links to other pages

History

I wrote this script because I wanted to move to a PHP-yes-but-MySQL-no web hoster, and did not find any (free) script that fit my technical and aesthetic needs. So I just wrote my own!
And I while I was about it, I thought that if I could not find that had all the features I wanted,
maybe more people felt the same and would appreciate if I made my efforts public and free for them to use, too. The name itself is not too nice, I know, but names like phpBook and phpGB were already taken, and I wanted to include the feature of storing the data in a flat text file.

Requirements

To install flatPHPbook on your website, you need PHP version 4 (or higher), and that's basically it. I cannot guarantee it will run, but I tested it on different combinations of Apache (both 1.3.x and 2.x)
and PHP 4.x.

I would like to hear from difficulties though, so I can improve the script!